Packet Captures
RIPv1_subnet_down.cap 1.0 KB
Submitted Sep 14, 2009
RIPv1 routes are being flooded on the R1-R2 link. R2's connection to 192.168.2.0/24 goes down, and the route is advertised as unreachable (metric 16) in packet #5. Capture perspective from R1's 10.0.1.1 interface.
| Packets: 8 | Duration: 58s | Downloads: 6518 |
RIPv1.cap 876 bytes
Submitted Sep 14, 2009
A RIPv1 router periodically flooding its database. Capture perspective from R1's 10.0.1.1 interface.
| Packets: 6 | Duration: 65s | Downloads: 7673 |
RADIUS.cap 775 bytes
Submitted Sep 14, 2009
A RADIUS authentication request is issued from a switch at 10.0.0.1 on behalf of an EAP client. The user authenticates via MD5 challenge with the username "John.McGuirk" and the password "S0cc3r".
| Packets: 4 | Duration: n/a | Downloads: 15696 |
PPP_TCP_compression.cap 1.5 KB
Submitted Sep 14, 2009
A telnet session is established to 191.1.13.3 across a PPP link performing TCP header compression. The user at 191.1.13.1 logs in with the password "cisco" and terminates the connection.
| Packets: 43 | Duration: 3s | Downloads: 6503 |
PPP.cap 3.6 KB
Submitted Sep 14, 2009
ICMP across a PPP serial link.
| Packets: 50 | Duration: 83s | Downloads: 8099 |
PIMv2_hellos.cap 528 bytes
Submitted Sep 14, 2009
Routers 1 and 2 exchange PIMv2 hello packets.
| Packets: 6 | Duration: 63s | Downloads: 9271 |
PIMv2_bootstrap.cap 712 bytes
Submitted Sep 14, 2009
Router 1 is the BSR and routers 2 and 3 are candidate RPs with the default priority of 0. R1 collects the RP advertisement unicasts from R2 and R3 and combines them in a bootstrap multicast to all PIM routers. Capture perspective is the R1-R3 link.
| Packets: 8 | Duration: 184s | Downloads: 7346 |
PIM-SM_join_prune.cap 3.8 KB
Submitted Sep 14, 2009
A host on R4's 172.16.20.0/24 subnet requests to join the 239.123.123.123 group. R4 sends a PIMv2 join message up to the RP (R1). Subsequent join messages are sent every 30 seconds, until R4 determines it no longer has any interested hosts and sends a prune request (packet #45). PIMv1 RP-Reachable messages for the group are also visible from R1.
| Packets: 47 | Duration: 473s | Downloads: 11553 |
PIM-DM_pruning.cap 10.2 KB
Submitted Sep 14, 2009
The multicast source at 172.16.40.10 begins sending traffic to the group 239.123.123.123, and PIM-DM floods the traffic down the tree. R4 has no group members, and prunes itself from the tree. R2 and R3 then realize they have no members, and each prunes itself from the tree. The capture shows R2 receiving the multicast traffic flooded from R1 and subsequently pruning itself every three minutes.
| Packets: 38 | Duration: 415s | Downloads: 7053 |
path_MTU_discovery.cap 6.2 KB
Submitted Sep 14, 2009
Tracepath is used to determine the MTU of the path between hosts 192.168.0.2 and .1.2. Packet #6 contains an ICMP "fragmentation needed" message, indicating the MTU for that hop is 1400 bytes.
| Packets: 8 | Duration: n/a | Downloads: 13106 |
OSPF_with_MD5_auth.cap 4.6 KB
Submitted Sep 14, 2009
An OSPF adjacency is formed between two routers configured to use MD5 authentication.
| Packets: 34 | Duration: 63s | Downloads: 7897 |
OSPF_type7_LSA.cap 3.6 KB
Submitted Sep 14, 2009
Area 10 is configured as a not-so-stubby area (NSSA). The capture records the adjacency formed between routers 2 and 3. The link state update in packet #11 includes several type 7 LSAs from R2. Capture perspective from R3's 10.0.10.1 interface.
| Packets: 25 | Duration: 32s | Downloads: 9053 |
OSPF_point-to-point_adjacencies.cap 9.9 KB
Submitted Sep 14, 2009
The frame relay network between four routers is configured with point-to-point subinterfaces. No DR/BDR is required as all adjacencies are point-to-point. Capture perspective from R1.
| Packets: 93 | Duration: 35s | Downloads: 11008 |
OSPF_NBMA_adjacencies.cap 11.7 KB
Submitted Sep 14, 2009
Formation of OSPF adjacencies across a Non-broadcast Multiaccess (NBMA) frame relay topology. Neighbors have been manually specified on all routers, with R1 configured to become the DR. No BDR is present. Capture perspective from R1.
| Packets: 99 | Duration: 66s | Downloads: 7505 |
OSPF_multipoint_adjacencies.cap 16.3 KB
Submitted Sep 14, 2009
Routers 1 through 4 are configured to view the non-broadcast frame relay network as a point-to-multipoint topology. Adjacencies are formed without the need of a DR or BDR. Note that inverse ARP was used to dynamically learn the addresses of neighbors.
ARP Frame Relay IP LMI OSPF Q933
| Packets: 196 | Duration: 277s | Downloads: 8926 |
OSPF_LSA_types.cap 4.0 KB
Submitted Sep 14, 2009
Capture of adjacency formation between OSPF routers 4 and 5 in area 20. Packet #12 contains LSAs of types 1, 2, 3, 4, and 5.
| Packets: 30 | Duration: 63s | Downloads: 12220 |
OSPF_broadcast_adjacencies.cap 8.4 KB
Submitted Sep 14, 2009
Three routers form OSPF adjacencies across a broadcast segment. All interface priorities are left default, so R3 (with the highest router ID) becomes the DR, and R2 (with the next-highest router ID) becomes the BDR. Capture perspective from R1.
| Packets: 74 | Duration: 95s | Downloads: 9943 |
NHRP_registration.cap 648 bytes
Submitted Sep 14, 2009
R2 registers a multipoint GRE tunnel with R1. Capture perspective from the R1-R5 link.
| Packets: 4 | Duration: n/a | Downloads: 7245 |
mtrace.cap 238 bytes
Submitted Sep 14, 2009
mtrace 172.16.40.1 172.16.20.1 is issued on R1 to trace the RPF path from R4's 172.16.20.0/24 subnet to R1's 172.16.40.0/24 subnet. The capture is taken on the R1-R3 link.
| Packets: 2 | Duration: n/a | Downloads: 6169 |
MSDP.cap 4.1 KB
Submitted Sep 14, 2009
R2 and R3 become MSDP peers and exchange keepalives. A multicast source 172.16.40.10 begins sending traffic to group 239.123.123.123, and R2 begins sending periodic source active messages to R3. Capture perspective is the R2-R3 link.
| Packets: 35 | Duration: 391s | Downloads: 6326 |
mrinfo_query.cap 182 bytes
Submitted Sep 14, 2009
mrinfo 2.2.2.2 is issued on R1. DVMRPv3 is used to query R2 for its multicast interfaces.
| Packets: 2 | Duration: n/a | Downloads: 5638 |
MPLS_encapsulation.cap 1.3 KB
Submitted Sep 14, 2009
Capture taken from the PE1-P1 link. ICMP traffic between CE1 and CE2 is encapsulated outbound with MPLS label 18. Note that returning traffic is not labeled, due to penultimate hop popping (PHP).
| Packets: 10 | Duration: n/a | Downloads: 12303 |
mGRE_ICMP.cap 3.7 KB
Submitted Sep 14, 2009
R2 begins sending ICMP traffic to R4, but it currently only has a GRE tunnel open to R1. The first two ICMP requests (packets #1 and #4) are routed through R1 while R2 sends an NHRP request to R1 for R4's spoke address. Once a GRE tunnel is dynamically built between spoke routers R2 and R4, R2 begins routing the ICMP traffic directly to R4. Capture perspective from the R2-R5 link.
| Packets: 24 | Duration: 10s | Downloads: 11117 |
LDP_adjacency.cap 5.7 KB
Submitted Sep 14, 2009
PE1 and P1 multicast LDP hellos to 224.0.0.2 on UDP port 646. They then establish an adjacency on TCP port 646 and exchange labels.
| Packets: 61 | Duration: 108s | Downloads: 9751 |
ISAKMP_sa_setup.cap 2.0 KB
Submitted Sep 14, 2009
An ISAKMP session is established prior to setting up an IPsec tunnel. Phase one occurs in main mode, and phase two occurs in quick mode.
| Packets: 9 | Duration: n/a | Downloads: 12247 |